The pedagogy aspect of game is very strong.
The game really does help students see that things are coming together in a certain way instead of letters on the board.
Students that played the game did better on exams.
Visuals are great, and games create environment for critical thinking.
It complements the curriculum. Students need multiple representations for long term learning to occur. This also puts multiple senses to work.
It is great for getting students engaged. There are good systems of modeling in the game that are hard to get anywhere else.